View source for Cosmics Checkout

This work done by Rupesh Silwal, Dustin McNulty, Bob Michaels, Kent Pashke:

*Use cosmic rays to checkout the condition of the HAPPEX detectors, BugsBunny (BB) and DaffyDuck (DD), along the entire 1.5m length of their acrylic/lead sandwiches.
*Setup cosmic trigger (using paddles from Bogdan) and the right HRS DAQ to take data.  Trigger was setup for cosmic rays passing at 45 degree angle  through detector at various distances from the PMT.  
*We used the PMT labelled "Jack" for both the BB and DD detectors.
*Typical runs (at each trigger position) last between 12 and 24 hours with an event rate of about 6000 total events/24 hrs.  Of the 6000 total events, ~1200 (or 20%) pass the trigger cuts.


Here is an example ADC distribution for DD/Jack
Image:HapDet study 4076.gif